Designation for a Digital heater using natural
gas is “EN”.
Prefix “P” is for plastic (polymer) headers; “C”
is for cast iron (ASME) headers.
Suffix “X” is for cupro-nickel tubing; “C” is
for copper tubing
Example: P-R407A-EN-X = Plastic headers,
407 model size, digital, natural gas,
cupro-nickel
For elevations above 5000 feet consult the
factory.
Manufactured under Patent No. 3,623,458.
Plastic (polymer) headers cannot be used for
installations requiring ASME certification.
|
How to Pick the Right Size Heater
Proper heater size is based on the time required
to heat the pool or spa. If water is heated for
each intended use, energy-saving rapid heating
may be appropriate.
If water is gradually heated to the desired
temperature and then maintained at that
temperature, a smaller heater may be acceptable.
To determine proper heater
size, use the following formula. |
|
|
______ |
Desired water temperature (°F) |
|
(minus) –
|
______ |
Average air temperature (°F) |
|
(equals) =
|
______ |
Required temperature rise (°F) |
|
(divided) ÷
|
______ |
Required time to heat pool/spa to
desired water temp. (hours) |
|
(equals) =
|
______ |
Required temperature rise per hour (°F) |
|
|
Model
|
Pool Size - Square Feet
|
|
300
|
400
|
500
|
600
|
700
|
800
|
1000
|
|
Desired temperature rise in °F per
hour
|
|
207
|
1-1/2
|
1-1/4
|
1
|
1
|
3/4
|
-
|
-
|
|
267
|
2
|
1-3/4
|
1-1/2
|
1-1/2
|
1
|
3/4
|
|
|
337
|
3
|
2
|
2
|
1-3/4
|
1-1/4
|
1
|
3/4
|
|
407
|
3-1/2
|
2-3/4
|
2-1/2
|
2
|
1-1/2
|
1-1/4
|
1
|
|
|
Model
|
Spa Size - Gallons
|
|
300
|
400
|
500
|
600
|
700
|
800
|
1000
|
|
Desired temperature rise in °F per
hour
|
|
207
|
65
|
49
|
39
|
33
|
28
|
25
|
20
|
|
267
|
87
|
65
|
52
|
44
|
37
|
33
|
26
|
|
337
|
109
|
82
|
65
|
55
|
47
|
41
|
33
|
|
407
|
131
|
98
|
79
|
65
|
56
|
49
|
39
|
|
